211 lines
4.9 KiB
C
211 lines
4.9 KiB
C
/*
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* lib/netfilter/log_msg.c Netfilter Log Message
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
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* Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
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* Copyright (c) 2007 Secure Computing Corporation
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* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
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*/
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/**
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* @ingroup nfnl
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* @defgroup log Log
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* @brief
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* @{
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*/
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#include <sys/types.h>
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#include <linux/netfilter/nfnetlink_log.h>
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#include <netlink-private/netlink.h>
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#include <netlink/attr.h>
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#include <netlink/netfilter/nfnl.h>
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#include <netlink/netfilter/log_msg.h>
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#include <byteswap.h>
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#if __BYTE_ORDER == __BIG_ENDIAN
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static uint64_t ntohll(uint64_t x)
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{
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return x;
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}
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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static uint64_t ntohll(uint64_t x)
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{
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return bswap_64(x);
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}
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#endif
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static struct nla_policy log_msg_policy[NFULA_MAX+1] = {
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[NFULA_PACKET_HDR] = {
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.minlen = sizeof(struct nfulnl_msg_packet_hdr)
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},
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[NFULA_MARK] = { .type = NLA_U32 },
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[NFULA_TIMESTAMP] = {
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.minlen = sizeof(struct nfulnl_msg_packet_timestamp)
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},
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[NFULA_IFINDEX_INDEV] = { .type = NLA_U32 },
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[NFULA_IFINDEX_OUTDEV] = { .type = NLA_U32 },
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[NFULA_IFINDEX_PHYSINDEV] = { .type = NLA_U32 },
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[NFULA_IFINDEX_PHYSOUTDEV] = { .type = NLA_U32 },
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[NFULA_HWADDR] = {
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.minlen = sizeof(struct nfulnl_msg_packet_hw)
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},
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//[NFULA_PAYLOAD]
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[NFULA_PREFIX] = { .type = NLA_STRING, },
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[NFULA_UID] = { .type = NLA_U32 },
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[NFULA_GID] = { .type = NLA_U32 },
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[NFULA_SEQ] = { .type = NLA_U32 },
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[NFULA_SEQ_GLOBAL] = { .type = NLA_U32 },
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};
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int nfnlmsg_log_msg_parse(struct nlmsghdr *nlh, struct nfnl_log_msg **result)
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{
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struct nfnl_log_msg *msg;
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struct nlattr *tb[NFULA_MAX+1];
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struct nlattr *attr;
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int err;
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msg = nfnl_log_msg_alloc();
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if (!msg)
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return -NLE_NOMEM;
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msg->ce_msgtype = nlh->nlmsg_type;
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err = nlmsg_parse(nlh, sizeof(struct nfgenmsg), tb, NFULA_MAX,
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log_msg_policy);
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if (err < 0)
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goto errout;
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nfnl_log_msg_set_family(msg, nfnlmsg_family(nlh));
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attr = tb[NFULA_PACKET_HDR];
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if (attr) {
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struct nfulnl_msg_packet_hdr *hdr = nla_data(attr);
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if (hdr->hw_protocol)
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nfnl_log_msg_set_hwproto(msg, hdr->hw_protocol);
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nfnl_log_msg_set_hook(msg, hdr->hook);
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}
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attr = tb[NFULA_MARK];
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if (attr)
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nfnl_log_msg_set_mark(msg, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_TIMESTAMP];
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if (attr) {
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struct nfulnl_msg_packet_timestamp *timestamp = nla_data(attr);
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struct timeval tv;
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tv.tv_sec = ntohll(timestamp->sec);
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tv.tv_usec = ntohll(timestamp->usec);
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nfnl_log_msg_set_timestamp(msg, &tv);
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}
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attr = tb[NFULA_IFINDEX_INDEV];
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if (attr)
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nfnl_log_msg_set_indev(msg, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_IFINDEX_OUTDEV];
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if (attr)
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nfnl_log_msg_set_outdev(msg, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_IFINDEX_PHYSINDEV];
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if (attr)
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nfnl_log_msg_set_physindev(msg, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_IFINDEX_PHYSOUTDEV];
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if (attr)
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nfnl_log_msg_set_physoutdev(msg, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_HWADDR];
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if (attr) {
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struct nfulnl_msg_packet_hw *hw = nla_data(attr);
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nfnl_log_msg_set_hwaddr(msg, hw->hw_addr, ntohs(hw->hw_addrlen));
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}
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attr = tb[NFULA_PAYLOAD];
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if (attr) {
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err = nfnl_log_msg_set_payload(msg, nla_data(attr), nla_len(attr));
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if (err < 0)
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goto errout;
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}
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attr = tb[NFULA_PREFIX];
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if (attr) {
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err = nfnl_log_msg_set_prefix(msg, nla_data(attr));
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if (err < 0)
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goto errout;
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}
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attr = tb[NFULA_UID];
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if (attr)
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nfnl_log_msg_set_uid(msg, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_GID];
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if (attr)
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nfnl_log_msg_set_gid(msg, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_SEQ];
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if (attr)
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nfnl_log_msg_set_seq(msg, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_SEQ_GLOBAL];
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if (attr)
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nfnl_log_msg_set_seq_global(msg, ntohl(nla_get_u32(attr)));
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*result = msg;
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return 0;
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errout:
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nfnl_log_msg_put(msg);
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return err;
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}
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static int log_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
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struct nlmsghdr *nlh, struct nl_parser_param *pp)
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{
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struct nfnl_log_msg *msg;
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int err;
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if ((err = nfnlmsg_log_msg_parse(nlh, &msg)) < 0)
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goto errout;
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err = pp->pp_cb((struct nl_object *) msg, pp);
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errout:
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nfnl_log_msg_put(msg);
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return err;
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}
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/** @} */
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#define NFNLMSG_LOG_TYPE(type) NFNLMSG_TYPE(NFNL_SUBSYS_ULOG, (type))
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static struct nl_cache_ops nfnl_log_msg_ops = {
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.co_name = "netfilter/log_msg",
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.co_hdrsize = NFNL_HDRLEN,
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.co_msgtypes = {
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{ NFNLMSG_LOG_TYPE(NFULNL_MSG_PACKET), NL_ACT_NEW, "new" },
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END_OF_MSGTYPES_LIST,
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},
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.co_protocol = NETLINK_NETFILTER,
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.co_msg_parser = log_msg_parser,
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.co_obj_ops = &log_msg_obj_ops,
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};
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static void __init log_msg_init(void)
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{
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nl_cache_mngt_register(&nfnl_log_msg_ops);
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}
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static void __exit log_msg_exit(void)
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{
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nl_cache_mngt_unregister(&nfnl_log_msg_ops);
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}
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/** @} */
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